Copper Oxalate

Cumene Hydroperoxide Copper Acetate Copper Arsenite Copper Bromide Copper Chloride Copper Fluoioborate Copper Arsenite Copper Cyanide Copper Nitrate Copper Oxalate Copper Sulfate... 

Chisholm, J. E., Jones, G. C. Purvis, O. W. (1987). Hydrated copper oxalate, moolooite, in lichens. Mineralogical Magazine, 51, 715-18. 

Purvis, O. W. (1984). The occurrence of copper oxalate in lichens growing on copper sulphide-bearing rocks in Scandinavia. Lichenologist, 16, 197-204. 

Prompt stabilization of ascorbic acid is especially important in the case of plasma or serum samples. Metaphosphoric acid is often used for this purpose because it also serves as a protein precipitant. Such properties are desirable in the inactivation of oxidase and the catalytic eflFect of copper. Oxalic acid is an attractive stabilizer for ascorbic acid analysis because of its lower cost and greater stability however, it is not a protein precipitant, therefore, it has a limited use for the extraction of animal tissues. The use of ethylenediaminetetraacetic acid (EDTA) in addition to the metaphosphoric acid has been recommended (96). EDTA would chelate divalent cations, and a study has shown it will stabilize ascorbic acid in the presence of copper for several days (96). Perchloric acid has been used also but because of its inherent dangerous properties its use is generally avoided. Trichloroacetic acid and EDTA also seem appropriate extractants for ascorbate in plant materials (97). 

Monochloroacetaldehyde is a valuable intermediate for the synthesis of organics. Normally such chlorinated products are burnt thermally or decomposed by alkali others are also degraded biologically. Oxalic acid forms insoluble copper oxalate. It is thermally decomposed continuously by heating a small sidestream of the catalyst according to eq. (30). 

The thermal decomposition of copper oxalate in Nj has been studied recently by Coetzee et al. [73]. Decomposition started at about 533 K and took place in one stage. The mass of the solid product from the decomposition corresponded to the formation of CujO. Evolved gas analysis showed that both COj and CO are evolved during the decomposition. The proportion of CO in the evolved gas was greatest during the initial period and declined steadily as the reaction proceeded. The DSC results showed that (unlike the oxalates [M(C204)(H20)2] J the decomposition of copper oxalate in N2 is exothermic with an enthalpy change of -33 kJ mol. ... 

The thermal behaviour of the mixed metal copper oxalates, MCu(C204)2.3H20, (M = Fe, Co, and Ni) [73,102] differs from that of the individual metal oxalates and of copper(II) oxalate. The dehydrations were single-stage deceleratory processes, as... 

Zhabrova etal. [151] identified the reactions of nickel, cobalt and copper oxalates ( , = 150, 159 and 129 kJ mol respectively) as redox processes in which there is an autocatalytic effect by product metal on the electron transfer step. The decomposition rate was determined by the area of the reactant and results were fitted by the Prout-Tompkins equation. In contrast, the reactions of magnesium, manganese and iron oxalates (f, = 200,167 and 184 kJ mol ) are not autocatalytic and the area... 

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